Crazy Aunt Karen's friend Deb from Cuyahoga Falls, Ohio provided the pictures of one of her Labradors "Sunny" wearing his red LED collar both in the daylight and after dark. Deb's other dog "Giovanni" also has the red collar, so Deb set Sunny's to "constant on" and Gio's to "flash mode" so she could identify either one in their fenced-in backyard -- which is pitch dark at night! Or, besides using different flash modes, another great idea for multiple dog households is to order a different color collar for each dog!!